X-ray diffraction study of residual elastic stress and microstructure of near-surface layers in nickel-titanium alloy irradiated with low-energy high-current electron beams

L. L. Meisner, A. I. Lotkov, M. G. Ostapenko, E. Yu Gudimova

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

In the work, we compare quantitative estimates of residual stresses in nickel-titanium (NiTi) alloy surface layers after electron beam treatment. The quantitative estimates to be compared were taken using X-ray diffraction (XRD) techniques with symmetric and asymmetric Bragg diffraction geometries. A method of quantitative X-ray diffraction estimation of residual stresses in materials with gradient changes in microstructure and physical properties, including elastic moduli, is described. It is found that in a NiTi specimen with one side irradiated by a low-energy high-current electron beam, the maximum residual elastic stresses σ ≈550 MPa are localized in the modified surface layer (melted by the electron beam and rapidly quenched), whereas the residual elastic stresses in the underlying layer with initial B2 structure are no greater than ∼100 MPa. It is for this reason that stress-induced B19′ martensite is formed in the material layer beneath the modified layer.

Original languageEnglish
Pages (from-to)398-404
Number of pages7
JournalApplied Surface Science
Volume280
DOIs
Publication statusPublished - 1 Sep 2013

Fingerprint

Nickel alloys
Titanium alloys
Electron beams
X ray diffraction
Microstructure
Residual stresses
Martensite
Physical properties
Titanium
Diffraction
Elastic moduli
Nickel
Geometry
nitinol

Keywords

  • Electron beam treatment
  • Gradient microstructural changes
  • Nickel-titanium alloy
  • Residual elastic stresses
  • Surface layers
  • X-ray diffraction analysis

ASJC Scopus subject areas

  • Surfaces, Coatings and Films

Cite this

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title = "X-ray diffraction study of residual elastic stress and microstructure of near-surface layers in nickel-titanium alloy irradiated with low-energy high-current electron beams",
abstract = "In the work, we compare quantitative estimates of residual stresses in nickel-titanium (NiTi) alloy surface layers after electron beam treatment. The quantitative estimates to be compared were taken using X-ray diffraction (XRD) techniques with symmetric and asymmetric Bragg diffraction geometries. A method of quantitative X-ray diffraction estimation of residual stresses in materials with gradient changes in microstructure and physical properties, including elastic moduli, is described. It is found that in a NiTi specimen with one side irradiated by a low-energy high-current electron beam, the maximum residual elastic stresses σ ≈550 MPa are localized in the modified surface layer (melted by the electron beam and rapidly quenched), whereas the residual elastic stresses in the underlying layer with initial B2 structure are no greater than ∼100 MPa. It is for this reason that stress-induced B19′ martensite is formed in the material layer beneath the modified layer.",
keywords = "Electron beam treatment, Gradient microstructural changes, Nickel-titanium alloy, Residual elastic stresses, Surface layers, X-ray diffraction analysis",
author = "Meisner, {L. L.} and Lotkov, {A. I.} and Ostapenko, {M. G.} and Gudimova, {E. Yu}",
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T1 - X-ray diffraction study of residual elastic stress and microstructure of near-surface layers in nickel-titanium alloy irradiated with low-energy high-current electron beams

AU - Meisner, L. L.

AU - Lotkov, A. I.

AU - Ostapenko, M. G.

AU - Gudimova, E. Yu

PY - 2013/9/1

Y1 - 2013/9/1

N2 - In the work, we compare quantitative estimates of residual stresses in nickel-titanium (NiTi) alloy surface layers after electron beam treatment. The quantitative estimates to be compared were taken using X-ray diffraction (XRD) techniques with symmetric and asymmetric Bragg diffraction geometries. A method of quantitative X-ray diffraction estimation of residual stresses in materials with gradient changes in microstructure and physical properties, including elastic moduli, is described. It is found that in a NiTi specimen with one side irradiated by a low-energy high-current electron beam, the maximum residual elastic stresses σ ≈550 MPa are localized in the modified surface layer (melted by the electron beam and rapidly quenched), whereas the residual elastic stresses in the underlying layer with initial B2 structure are no greater than ∼100 MPa. It is for this reason that stress-induced B19′ martensite is formed in the material layer beneath the modified layer.

AB - In the work, we compare quantitative estimates of residual stresses in nickel-titanium (NiTi) alloy surface layers after electron beam treatment. The quantitative estimates to be compared were taken using X-ray diffraction (XRD) techniques with symmetric and asymmetric Bragg diffraction geometries. A method of quantitative X-ray diffraction estimation of residual stresses in materials with gradient changes in microstructure and physical properties, including elastic moduli, is described. It is found that in a NiTi specimen with one side irradiated by a low-energy high-current electron beam, the maximum residual elastic stresses σ ≈550 MPa are localized in the modified surface layer (melted by the electron beam and rapidly quenched), whereas the residual elastic stresses in the underlying layer with initial B2 structure are no greater than ∼100 MPa. It is for this reason that stress-induced B19′ martensite is formed in the material layer beneath the modified layer.

KW - Electron beam treatment

KW - Gradient microstructural changes

KW - Nickel-titanium alloy

KW - Residual elastic stresses

KW - Surface layers

KW - X-ray diffraction analysis

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JO - Applied Surface Science

JF - Applied Surface Science

SN - 0169-4332

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